Factoring - Quadratic Trinomials - a is 1

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The following Jing video demonstrates how to factor quadratic trinomials of the form.

$x^2+bx+c$

The problem below is shown in the video. Give it a try before you start the video if you want.

Directions: Please factor the following.
$x^2-8x-20$



If you want to take a look at another example, please consider the following.